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x in (-oo:+oo)
x/(-5) = 8-2 // - 8-2
x/(-5)-8+2 = 0
-1/5*x-6 = 0 // + 6
-1/5*x = 6 // : -1/5
x = 6/(-1/5)
x = -30
x = -30
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